Mirror arm



FIG. 1 is a top isometric view of a mirror arm embodying our new design;

FIG. 2 is a bottom isometric view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the mirror arm and environmental structure that form no part of the claimed design. 

CLAIM The ornamental design for a mirror arm, as shown and described. 